I have a 5x7 reducing back for my Ritter 8x10. (Note: the Ritter 8x10 is almost 8 lbs lighter than a Zone VI or Wisner 8x10) The lighter Ritter allows a lighter tripod and lighter tripod head. I love the look of an 8x10 Azo print and find I shoot about 100 8x10 negatives for every 10 5x7 negatives. Yes, the 8x10 holders are heavier, but if weight were an major issue, I'd be using a 35mm. The quality of the image is what matters, and it trumps the weight issue.....at least it does for me. As stated earlier in this thread, nothing beats working with an 8x10 ground glass. YMMV